From a thread in the PSI forum, it appears that PSI's detections lagged behind the Adobe release by about 5 days but were eventually updated to properly identify Adobe Reader 9.3.1. 7 days after release, OSI is still identifying Reader 9.3.1 as 9.3.0 and calling it insecure.

The OSI, PSI and CSI all use the same database. The OSI does flag fewer applications, but there is no difference between the rules of one product and the other. It is therefore quite likely that @thedillpicks suggestion is correct, and the first step towards fixing this is indeed checking for more than one version installed. Please post back with the requested information.

It is correct that we had a problem with the Adobe products, as has happened before. This should now be solved.

OK, the detection is the same for both OSI and PSI. I've narrowed the problem to only occuring for installs that used a 9.3.0 .msi that's been slipstreamed with the 9.3.1 .msp patch. Apparently that type of installation does not create some file or registry value that OSi and PSI use to confirm the 9.3.1 update.

Many people around the world use and enjoy the benefit of a more secure system for free thanks to Secunia. Adobe products do have a habit of being difficult to update. If you would care to download PSI and post back here I would be happy to help you.

I have the same results as cyberquotient on my PC at home:
1) OSI still flags Adobe Reader 9.3.1 as insecure.
2) It complains about c:\Program Files\Adobe\Reader 9.0\Reader AcroRd32.exe, which it says is the insecure version 9.3.0.148.
3) When I click on the link provided by OSI, it downloads the 9.3.1 patcher AdbeRdrUpd931_all_incr.msp. After I run this and rescan with the OSI, Adobe Reader still is flagged as insecure.
4) AcroForm.api is version 9.3.1.203 and plug_ins\authplay.dll is version 10.0.45.2, confirming that the patch was properly installed.
5) When I scan with PSI instead of OSI, it reports Adobe Reader as patched and as version 9.3.1.0. The instalation path is:
C:\Program Files\Adobe\Reader 9.0\Reader\AcroRd32.exe
6) I haven't been able to find an Adobe Reader installer for 9.3.1; apparently you must first install 9.3.0 then apply the patch for 9.3.1.

I get the same results for 1-4 and 6 on my work computer. Both my home and work computers are running 32-bit Windows XP Pro with SP3 and Adobe Reader 9.3.1. At home I also have PSI 1.5.0.0 installed. Please fix the OSI; as much as I'd like to use the PSI on my computer at work, the license agreement forbids me from doing so.

As of March 10 I'm still seeing the problem referenced above. I've used the update file that OSI indicates, done both a hard and soft reboot. I've uninstalled Reader and then re-installed and patched as indicated in the OSI and rebooted, and I'm still seeing Reader flagged as insecure.

I think something like this happened once before and while the program was actually updated, the update failed to remove an older file.

In any case, this proves that OSI and PSI are looking at different things to make their determination. Whether they use the same database is irrelevant; the point is that the results are different, and one of them is wrong.